<http://schema.org/about>
"A NASA mission arriving in the Pluto system next year could help scientists figure out if Charon might have once harbored a subsurface ocean of liquid water."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/did-plutos-largest-moon-once-have-a-subsurface-ocean>